From: Andi Kleen <ak@suse.de>
To: Nishanth Aravamudan <nacc@us.ibm.com>
Cc: linuxppc-dev@ozlabs.org, linux-mm@kvack.org, lnxninja@us.ibm.com,
Christoph Lameter <clameter@sgi.com>
Subject: Re: libnuma interleaving oddness
Date: Wed, 30 Aug 2006 09:19:13 +0200 [thread overview]
Message-ID: <200608300919.13125.ak@suse.de> (raw)
In-Reply-To: <20060830002110.GZ5195@us.ibm.com>
mous pages.
>
> The order is (with necessary params filled in):
>
> p = mmap( , newsize, RW, PRIVATE, unlinked_hugetlbfs_heap_fd, );
>
> numa_interleave_memory(p, newsize);
>
> mlock(p, newsize); /* causes all the hugepages to be faulted in */
>
> munlock(p,newsize);
>
> From what I gathered from the numa manpages, the interleave policy
> should take effect on the mlock, as that is "fault-time" in this
> context. We're forcing the fault, that is.
mlock shouldn't be needed at all here. the new hugetlbfs is supposed
to reserve at mmap time and numa_interleave_memory() sets a VMA
policy which will should do the right thing no matter when the fault
occurs.
Hmm, maybe mlock() policy() is broken.
-Andi
WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <ak@suse.de>
To: Nishanth Aravamudan <nacc@us.ibm.com>
Cc: Christoph Lameter <clameter@sgi.com>,
linux-mm@kvack.org, linuxppc-dev@ozlabs.org, lnxninja@us.ibm.com,
agl@us.ibm.com
Subject: Re: libnuma interleaving oddness
Date: Wed, 30 Aug 2006 09:19:13 +0200 [thread overview]
Message-ID: <200608300919.13125.ak@suse.de> (raw)
In-Reply-To: <20060830002110.GZ5195@us.ibm.com>
mous pages.
>
> The order is (with necessary params filled in):
>
> p = mmap( , newsize, RW, PRIVATE, unlinked_hugetlbfs_heap_fd, );
>
> numa_interleave_memory(p, newsize);
>
> mlock(p, newsize); /* causes all the hugepages to be faulted in */
>
> munlock(p,newsize);
>
> From what I gathered from the numa manpages, the interleave policy
> should take effect on the mlock, as that is "fault-time" in this
> context. We're forcing the fault, that is.
mlock shouldn't be needed at all here. the new hugetlbfs is supposed
to reserve at mmap time and numa_interleave_memory() sets a VMA
policy which will should do the right thing no matter when the fault
occurs.
Hmm, maybe mlock() policy() is broken.
-Andi
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next prev parent reply other threads:[~2006-08-30 7:20 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-29 23:15 libnuma interleaving oddness Nishanth Aravamudan
2006-08-29 23:15 ` Nishanth Aravamudan
2006-08-29 23:57 ` Christoph Lameter
2006-08-29 23:57 ` Christoph Lameter
2006-08-30 0:21 ` Nishanth Aravamudan
2006-08-30 0:21 ` Nishanth Aravamudan
2006-08-30 2:26 ` Nishanth Aravamudan
2006-08-30 2:26 ` Nishanth Aravamudan
2006-08-30 4:26 ` Christoph Lameter
2006-08-30 4:26 ` Christoph Lameter
2006-08-30 5:31 ` Nishanth Aravamudan
2006-08-30 5:31 ` Nishanth Aravamudan
2006-08-30 5:40 ` Tim Pepper
2006-08-30 5:40 ` Tim Pepper
2006-08-30 7:19 ` Andi Kleen [this message]
2006-08-30 7:19 ` Andi Kleen
2006-08-30 7:29 ` Nishanth Aravamudan
2006-08-30 7:29 ` Nishanth Aravamudan
2006-08-30 7:32 ` Andi Kleen
2006-08-30 7:32 ` Andi Kleen
2006-08-30 18:01 ` Tim Pepper
2006-08-30 18:01 ` Tim Pepper
2006-08-30 18:12 ` Andi Kleen
2006-08-30 18:12 ` Andi Kleen
2006-08-30 18:13 ` Adam Litke
2006-08-30 18:13 ` Adam Litke
2006-08-30 21:04 ` Christoph Lameter
2006-08-30 21:04 ` Christoph Lameter
2006-08-31 6:00 ` Nishanth Aravamudan
2006-08-31 6:00 ` Nishanth Aravamudan
2006-08-31 7:47 ` Andi Kleen
2006-08-31 7:47 ` Andi Kleen
2006-08-31 15:49 ` Nishanth Aravamudan
2006-08-31 15:49 ` Nishanth Aravamudan
2006-08-31 16:00 ` [PATCH] fix NUMA interleaving for huge pages (was RE: libnuma interleaving oddness) Nishanth Aravamudan
2006-08-31 16:00 ` Nishanth Aravamudan
2006-08-31 16:08 ` Adam Litke
2006-08-31 16:08 ` Adam Litke
2006-08-31 16:19 ` Tim Pepper
2006-08-31 16:19 ` Tim Pepper
2006-08-31 16:37 ` Christoph Lameter
2006-08-31 16:37 ` Christoph Lameter
2006-08-30 17:44 ` libnuma interleaving oddness Adam Litke
2006-08-30 17:44 ` Adam Litke
2006-08-30 7:16 ` Andi Kleen
2006-08-30 7:16 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2006-08-29 23:02 Nishanth Aravamudan
2006-08-29 23:02 ` Nishanth Aravamudan
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